Chapter 4 SCSI Commands
MODE SENSE (6) / (10) Command (1Ah / 5Ah)
DLT-S4 Interface Reference Guide
183
Figure 95
SAS
— Logical Unit
Control
MODE SENSE
Page —
Data Format
Table 103
SAS
— Logical Unit
Control
MODE SENSE
Page —
Field Descriptions
Bit
Byte
7
6
5
4
3
2
1
0
0
PS (0)
SPF (0)
Page Code (18h)
1
Page Length (06h)
2
Reserved
Transport
Layer
Retries
Protocol Identifier (6h)
3
Reserved
4 — 7
Reserved
Field
Description
PS
Parameters Savable. Always set to 0.
SPF
SubPage Format. Always set to 0. Indicates that this page uses the page_0 page
format.
Page Code
Identifies the type of
MODE SENSE
page being transferred. A value of 18h identifies
this as the Logical Unit Control page.
Page Length
Indicates the number of bytes in the page, excluding bytes 0 and 1. The length is
returned on
MODE SENSE
and must subsequently be set to the same value when
performing
MODE SELECT
.
Protocol
Identifier
A value of 6h indicates that this mode page applies to an SAS-1.1 port (see the
Serial
Attached SCSI – 1. 1 (SAS-1.1)
standard for specific SAS information).
Transport Layer
Retries
Bit set to 1. Transport layer retries are supported by this devices as defined in SAS
1.1.